greenplumn CXformFactory 源码
greenplumn CXformFactory 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformFactory.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CXformFactory.h
//
// @doc:
// Management of global xform set
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformFactory_H
#define GPOPT_CXformFactory_H
#include "gpos/base.h"
#include "gpopt/xforms/CXform.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformFactory
//
// @doc:
// Factory class to manage xforms
//
//---------------------------------------------------------------------------
class CXformFactory
{
private:
// definition of hash map to maintain mappings
using XformNameToXformMap =
CHashMap<CHAR, CXform, gpos::HashValue<CHAR>, CXform::FEqualIds,
CleanupDeleteArray<CHAR>, CleanupNULL<CXform>>;
// memory pool
CMemoryPool *m_mp;
// range of all xforms
CXform *m_rgpxf[CXform::ExfSentinel];
// name -> xform map
XformNameToXformMap *m_phmszxform;
// bitset of exploration xforms
CXformSet *m_pxfsExploration;
// bitset of implementation xforms
CXformSet *m_pxfsImplementation;
// ensure that xforms are inserted in order
ULONG m_lastAddedOrSkippedXformId;
// global instance
static CXformFactory *m_pxff;
// private ctor
explicit CXformFactory(CMemoryPool *mp);
// actual adding of xform
void Add(CXform *pxform);
// skip unused xforms that have been removed, preserving
// xform ids of the remaining ones
void
SkipUnused(ULONG numXformsToSkip)
{
m_lastAddedOrSkippedXformId += numXformsToSkip;
}
public:
CXformFactory(const CXformFactory &) = delete;
// dtor
~CXformFactory();
// create all xforms
void Instantiate();
// accessor by xform id
CXform *Pxf(CXform::EXformId exfid) const;
// accessor by xform name
CXform *Pxf(const CHAR *szXformName) const;
// accessor of exploration xforms
CXformSet *
PxfsExploration() const
{
return m_pxfsExploration;
}
// accessor of implementation xforms
CXformSet *
PxfsImplementation() const
{
return m_pxfsImplementation;
}
// is this xform id still used?
BOOL IsXformIdUsed(CXform::EXformId exfid);
// global accessor
static CXformFactory *
Pxff()
{
return m_pxff;
}
// initialize global factory instance
static GPOS_RESULT Init();
// destroy global factory instance
static void Shutdown();
}; // class CXformFactory
} // namespace gpopt
#endif // !GPOPT_CXformFactory_H
// EOF
相关信息
相关文章
greenplumn CJoinOrderGreedy 源码
greenplumn CJoinOrderMinCard 源码
greenplumn CSubqueryHandler 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
6、 golang
-
7、 openharmony